Raypak 850, 300 Controls, Ignition Control Functions, High Limit - Manual Reset

Controls

WARNING: Installation, adjustment and service of controls, including timing of various operating func- tions, must be performed by a qualified installer, service agency or the gas supplier. Failure to do so may result in control damage, malfunction, property damage, personal injury, or death.

WARNING: Turn off the power to the boiler before installation, adjustment or service of any controls. Failure to do so may result in board damage, malfunction, property damage, personal injury, or death.

CAUTION: This appliance has provisions to be connected to more than one supply source. To reduce the risk of electric shock, disconnect all such connections before servicing.

CAUTION: Risk of electric shock: More than one disconnect switch may be required to de-energize the equipment before servicing.

Ignition Control Functions

When there is a call for heat, the combustion air blow- er starts to purge air from the combustion chamber. After the pre-purge, the igniter is energized. The stan- dard ignition module will lock out after failing to light four times or after losing flame three times during a single heat demand. To reset it, press and release the ESC/RESET button located on the user interface. The control will automatically reset after 1 hour. When in lock out, the control will run the blower for a 1 minute purge cycle. Turning off the power to the heater

WILL NOT reset the ignition module.

The optional single-try ignition module will attempt to light only one time before locking out. To reset it, press the ESC/RESET button on the user interface.

NOTE: Each ignition module is specific to a single model size. Care should be taken not to use a mod- ule intended for a different model size.

High Limit — Manual Reset

This boiler is equipped with a fixed-setting manual re- set high limit temperature device as standard or it may have an optional adjustable setting manual reset high temperature device.

The fixed-setting manual-reset high limit is located on the outlet pipe of the heat exchanger on the left side of the boiler (accessible through the front door for reset as necessary).

Fig. 26: High Limit (Manual Reset)

High Limit — Auto Reset (Optional)

This heater is equipped with a fixed auto-reset high limit temperature device.

The optional auto reset high limit is located on the heat exchanger header, near the outlet.

Fig. 27: High Limit (Auto Reset)

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